On my website (https://plainadventures.com.au/) I have a photo carousal using revolution slider on the home page. It is set up with vertical thumbnails on the right hand side. These use to be semi transparent which I felt looked quite good. I recently upgraded Revolution Slider and then just yesterday the thumbnails stopped showing. If I hover over where the thumbnails are, they are still there and can still click to the slide, however they are not visible. I get adjust the thumbails in Revolution Slider to make them solid but I prefer the look of semi transparent and I can’t see any option for this. Do you know how I can get it back to the way it was?